CN114017449A - Bidirectional overrunning clutch and transmission mode - Google Patents
Bidirectional overrunning clutch and transmission mode Download PDFInfo
- Publication number
- CN114017449A CN114017449A CN202111292166.1A CN202111292166A CN114017449A CN 114017449 A CN114017449 A CN 114017449A CN 202111292166 A CN202111292166 A CN 202111292166A CN 114017449 A CN114017449 A CN 114017449A
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- wedging
- pair
- groove
- input shaft
- upper cover
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 36
- 230000002457 bidirectional effect Effects 0.000 title abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
- F16D2041/0603—Sprag details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
The invention provides a bidirectional overrunning clutch and a transmission mode, the clutch comprises an output shaft, an input shaft and a wedging pair, the output shaft is provided with a cavity which is communicated up and down, a wedging groove is arranged in the cavity, the wedging pair comprises two wedging sheets and a tension spring, the wedging sheets are in a circular structure, grooves with inclined surfaces are arranged on the wedging sheets, the two wedging sheets are arranged up and down to enable the grooves on the two wedging sheets to be buckled into a blade groove with two narrow ends and a wide middle part, two ends of the tension spring are respectively connected with the two wedging sheets to enable the two wedging sheets to have force for keeping a joint state, a driving blade matched with the blade groove is arranged on the outer peripheral surface of a hollow shaft of the input shaft, the driving blade is arranged in the blade groove to enable the wedging pair to be arranged on the outer peripheral surface of the input shaft, the driving blade can move in the blade groove and support the two wedging sheets to be opened towards two ends, the wedging pair can be switched between the fitting state and the transmission state.
Description
Technical Field
The invention relates to the field of transmission devices, in particular to a bidirectional overrunning clutch and a transmission mode.
Background
In the production process of knitting machine spare and accessory parts, a vertical circular grinding machine, which is called a vertical grinder for short, is needed for processing. The operation of the vertical mill requires the motor to drive the vertical mill to rotate, and sometimes manual idling is needed to adapt to workpiece installation, adjustment or measurement.
Because the transmission is provided with a speed reducing mechanism, the transmission chain of the motor is required to be disconnected when the grinding machine is idle manually, otherwise, the workbench cannot be shifted, in the prior art, an electromagnetic clutch is usually used for the transmission of the vertical grinding machine, the electromagnetic clutch is disconnected when the grinding machine is not electrified, the transmission chain of the grinding machine and the transmission chain of the driving motor are disconnected, the workbench can be shifted forwards or backwards according to working requirements when the grinding machine is electrified, the workbench can be used for installing workpieces or performing operations such as circle centering or dimension measurement, and after the grinding machine is electrified, the electromagnetic clutch is connected and can be shifted forwards or backwards according to working requirements.
However, the electromagnetic clutch is easy to damage and fail, including that the electromagnetic coil is burnt out, the joint surface is abraded or sanded to cause insufficient binding force, and the repaired clearance after abrasion is improperly adjusted to cause failure, and the electromagnetic clutch is expensive and short in service life.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provide the bidirectional overrunning clutch and the transmission mode which are not easy to damage, simple in structure, low in cost and long in service life.
The invention adopts the following technical scheme.
A bidirectional overrunning clutch comprises an output shaft, an input shaft and a wedging pair, wherein the output shaft is provided with a cavity which is communicated from top to bottom, and a wedging groove is formed in the cavity, the wedging pair comprises two wedging sheets and a tension spring, the wedging sheets are of a circular ring structure, grooves with inclined planes are formed in the wedging sheets, the grooves in the two wedging sheets are oppositely buckled to form a blade groove with two narrow ends and a wide middle part, the two ends of the tension spring are respectively connected with the two wedging sheets to enable the two wedging sheets to have force for keeping the connection, a driving blade matched with the blade groove is arranged on the outer peripheral surface of a hollow shaft input shaft of a hollow structure of the input shaft, the driving blade is arranged in the blade groove to enable the wedging pair to be arranged on the outer peripheral surface of the input shaft, the driving blade can move in the blade groove and prop the two wedging sheets to two ends, so that the wedging pair can be switched between a connection state and a transmission state, the wedging pair is arranged in the wedging groove, so that the input shaft is arranged in a cavity of the output shaft, the groove width of the wedging groove is larger than the thickness of the wedging pair in a joint state, and when the wedging pair is in a transmission state, the top surface and the bottom surface of the wedging pair respectively extrude the top surface and the bottom surface of the wedging groove.
Further, the output shaft comprises an upper cover and an output end, the upper cover is arranged above the output end, an annular protrusion is formed in the cavity of the upper cover in an extending mode towards the inner side, a corresponding annular protrusion is formed in the cavity of the output end in an extending mode towards the inner side, the upper cover and the output end are connected through a bolt, and the two annular protrusions are arranged in parallel at intervals to form a wedging groove in an enclosing mode.
Furthermore, the bottom of the upper cover is provided with a positioning groove in a stepped arrangement, the inner diameter of the positioning groove is the same as the outer diameter of the top of the output end, the top of the output end can be inserted into the positioning groove and then is connected with the upper cover through a bolt,
the wedge-caulking groove is characterized by further comprising a first bearing and a second bearing, wherein the first bearing is arranged between the upper cover and the input shaft, the second bearing is arranged between the output end and the input shaft, a gap is formed between the top surface of the wedge-caulking pair in the attached state and the top surface of the wedge-caulking groove, and a gap is formed between the bottom surface of the wedge-caulking pair and the bottom surface of the wedge-caulking groove.
Furthermore, a first check ring is arranged on the annular protrusion of the upper cover, the first check ring and the annular protrusion of the upper cover enclose a first bearing groove, a second check ring is arranged below the annular protrusion of the output end, the second check ring and the annular protrusion of the output end enclose a second bearing groove, the first bearing is arranged in the first bearing groove, and the second bearing is arranged in the second bearing groove.
Furthermore, a plurality of driving teeth are uniformly arranged on the outer peripheral surface of the output end along the circumferential direction.
Furthermore, four grooves with inclined surfaces are formed in each wedging sheet, four grooves of the two wedging sheets are enclosed to form four blade grooves, the input shaft is correspondingly provided with four driving blades with two narrow ends and a wide middle, and the driving blades are in one-to-one correspondence with the blade grooves.
Furthermore, spring grooves are formed in the top and the bottom of the wedging pair, spring cross rods are arranged in the spring grooves, one end of each tension spring is hung on the spring cross rod at the top of the wedging pair, and the other end of each tension spring is hung on the spring cross rod at the bottom of the wedging pair.
A transmission mode of a clutch is characterized in that when an input shaft is kept still, a wedging pair keeps a joint state, the width of a wedging groove is larger than the thickness of the wedging pair in the joint state, and a transmission chain between an output shaft and the input shaft is disconnected, so that the output shaft can rotate independently; when the input shaft starts to rotate, the driving blade moves and props the wedging pair open towards two ends, the wedging pair is converted into a transmission state from a joint state, the top surface and the bottom surface of the wedging pair extrude the top surface and the bottom surface of the wedging groove, and the transmission chain between the output shaft and the input shaft is connected, so that the input shaft can drive the output shaft to rotate.
As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:
firstly, a driving blade on an input shaft is matched with a wedging groove on a wedging pair, the wedging pair consists of two wedging sheets and a tension spring, when the input shaft rotates, the driving blade can contact and prop against the wedging pair and prop the two wedging sheets open towards two ends, the wedging pair can be switched between a bonding state and a transmission state, when the input shaft is electrified to rotate, a transmission chain between the input shaft and an output shaft is jointed, and when the input shaft is not rotated when the input shaft is powered off, the transmission chain between the input shaft and the output shaft is disconnected.
And the second output shaft consists of an upper cover and an output end, and the wedging groove is defined by the annular bulge of the upper cover and the annular bulge of the output end, so that the installation of the wedging pair and the input shaft is simpler and more convenient.
And thirdly, a positioning groove is formed at the bottom of the upper cover, and the top of the output end can be inserted into the positioning groove and positioned and then connected with the upper cover through a bolt, so that the connection between the upper cover and the output end is more accurate and simple.
Fourthly, the output shaft and the input shaft can rotate relatively more smoothly through the first bearing and the second bearing.
Drawings
Fig. 1 is an overall structural sectional view of an embodiment of the present invention.
Fig. 2 is a partially enlarged view of an embodiment of the present invention, showing a structure of a caulking pair in a fitted state.
Fig. 3 is a partially enlarged view of the embodiment of the present invention, showing a structure in which the wedge pair is in a transmission state when the driving blade rotates forward.
Fig. 4 is a sectional view showing the overall structure of the output shaft of the present invention.
Fig. 5 is a schematic view of the overall structure of the input shaft of the present invention.
Fig. 6 is a plan view of the overall structure of the input shaft of the present invention.
Fig. 7 is a schematic view of the overall structure of the wedging pair of the present invention.
In the figure: 1. the driving mechanism comprises an output shaft, 10 cavities, 11 wedging grooves, 12 upper covers, 13 output ends, 14 bolts, 15 positioning grooves, 2 input shafts, 20 driving blades, 200 wedging inclined planes, 3 wedging pairs, 30 wedging sheets, 31 tension springs, 32 blade grooves, 33 spring grooves, 34 spring cross rods, 4 first bearings, 5 second bearings, 6 first retaining rings and 7 second retaining rings.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 1 to 7, the invention relates to a bidirectional overrunning clutch and a transmission mode, which is used for processing a vertical circular grinding machine of knitting machine parts and accessories, and comprises an output shaft 1, an input shaft 2, a wedging pair 3, a first bearing 4 and a second bearing 5, wherein the output shaft 1 is provided with a cavity 10 which is through up and down, a wedging groove 11 is arranged in the cavity 10, the wedging pair 3 comprises two wedging pieces 30 and a tension spring 31, the wedging piece 30 is in a circular ring structure, a groove with an inclined surface is arranged on the wedging piece 30, the two wedging pieces 30 are arranged up and down to be buckled into a blade groove 32 with two narrow ends and a wide middle, two ends of the tension spring 31 are respectively connected with the two wedging pieces 30 to enable the two wedging pieces 30 to have a force for keeping fit, the input shaft 2 is a hollow shaft with a hollow structure, a motor driving shaft of the vertical circular grinding machine is connected with the input shaft 2, a driving blade 20 matched with the blade groove 32 is arranged on the outer circumferential surface of the input shaft 2, the driving blade 20 is arranged in the blade groove 32 to enable the wedging pair 3 to be arranged on the outer peripheral surface of the input shaft 2, the driving blade 20 can move in the blade groove 32 and prop the two wedging sheets 30 open towards two ends, the wedging pair 3 can be switched between a bonding state and a transmission state, the wedging pair 3 is arranged in the wedging groove 11 to enable the input shaft 2 to be arranged in the cavity 10 of the output shaft 1, the groove width of the wedging groove 11 is larger than the thickness of the wedging pair 3 in the bonding state, and when the wedging pair 3 is in the transmission state, the top surface and the bottom surface of the wedging pair 3 respectively extrude the top surface and the bottom surface of the wedging groove 11.
The output shaft 1 comprises an upper cover 12 and an output end 13, the upper cover 12 is arranged above the output end 13, annular protrusions are formed by extending towards the inner side in a cavity of the upper cover 13, corresponding annular protrusions are formed by extending towards the inner side in the cavity of the output end 13, the upper cover 12 and the output end 13 are connected through bolts 14, the two annular protrusions are arranged in parallel at intervals to form wedging grooves 11 in a surrounding mode, a positioning groove 15 is formed in the bottom of the upper cover 13 in a stepped mode, the inner diameter of the positioning groove 15 is the same as the outer diameter of the top of the output end 13, the top of the output end 13 can be inserted into the positioning groove 15 and then connected with the upper cover 12 through the bolts 14, the output end 13 is a chain wheel structure with a plurality of driving teeth uniformly arranged on the outer peripheral surface in the circumferential direction, and other structures such as belt wheels or gears can be adopted.
The upper cover 12 is provided with a first retainer ring 6 on the annular protrusion, the first retainer ring 6 and the annular protrusion of the upper cover 12 enclose a first bearing groove, a second retainer ring 7 is arranged below the annular protrusion of the output end 13, the second retainer ring 7 and the annular protrusion of the output end enclose a second bearing groove, the first bearing 4 is arranged in the first bearing groove, the second bearing 5 is arranged in the second bearing groove, so that a gap exists between the top surface of the wedge pair 3 in the fitting state and the top surface of the wedge groove 11, and a gap exists between the bottom surface of the wedge pair 3 and the bottom surface of the wedge groove 11.
Each wedging sheet 30 is provided with four grooves with inclined surfaces, the four grooves of the two wedging sheets 30 enclose four blade grooves 11, the input shaft 2 is correspondingly provided with four driving blades 20 with two narrow ends and a wide middle part, the driving blades 20 correspond to the blade grooves 11 one by one, two ends of the driving blades 20 are provided with wedging inclined surfaces 200, the wedging inclined surfaces 200 can be wedged into the inclined surfaces of the wedging grooves 11 and prop the two wedging sheets 30 of the wedging pair 3 open towards two ends, so that the top surfaces and the bottom surfaces of the wedging pair 3 extrude the top surfaces and the bottom surfaces of the wedging grooves 11.
With continued reference to fig. 1 to 7, a transmission mode of the clutch, when the motor of the vertical circular mill is not in motion, the input shaft 2 remains in motion, the wedging pair 3 remains in a joint state, the groove width of the wedging groove 11 is greater than the thickness of the wedging pair 3 in the joint state, and the transmission chain between the output shaft 1 and the input shaft 2 is disconnected, so that the output shaft 1 can rotate alone without being influenced by the input shaft 2; when the motor of the vertical circular mill rotates, the motor drives the input shaft 2 to start rotating, the driving blade 20 moves, the wedged inclined surface 200 of the driving blade 20 is wedged into the inclined surface of the blade groove 32, the two wedging sheets 30 are propped open towards two ends, the wedging pair 3 is converted into a transmission state from a bonding state, the top surface and the bottom surface of the wedging pair 3 extrude the top surface and the bottom surface of the wedging groove 11, and the transmission chain between the output shaft 1 and the input shaft 2 is connected, so that the input shaft 2 can drive the output shaft 1 to rotate.
Because the inclined plane of the blade groove 11 and the wedging inclined plane of the driving blade 20 are both bidirectional, no matter the motor drives the input shaft 2 to rotate forwards or backwards, the wedging inclined plane 200 of the driving blade 20 can be wedged into the inclined plane of the blade groove 11 and prop the two wedging sheets 30 open towards two ends, so that the wedging pair 3 is converted into a transmission state, and the output shaft 1 is driven to rotate.
According to the strength theory, the root of the driving blade 20 is the weakest point, the product of the cross-sectional area and the shear strength of the material multiplied by the safety factor is the tangential shear force of the driving blade, the product of the radius of the root of the four driving blades 20 is the torque which can be transmitted, and assuming that the cross-sectional area of the root of the driving blade 20 is s, the radius of the root is r, the shear strength of the material is tau, and the torque which can be transmitted by the input shaft 2 is N1= s.tau.
Setting: the tangential shear force F, the wedging force G = F ÷ tan α of the pair 3 for the output shaft 1, is relatively large because the angle α of the ramp surface is generally relatively small. With a coefficient of friction of 0.15 between the steel and the steel part, N2=0.15 G.R is the torque that can be transmitted after wedging, which is generally greater than or equal to the torque that can be transmitted by the input shaft 2, i.e.: n2 is more than or equal to N1 to ensure no slipping, and proper structural dimension modification is needed in actual application according to factors such as applicable places, transmitted power or torque and the like.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (9)
1. A bi-directional overrunning clutch, comprising: the hollow shaft input shaft is of a hollow structure, the outer peripheral surface of the hollow shaft input shaft is provided with a driving blade matched with the blade groove, the driving blade is arranged in the blade groove to enable the wedging pair to be arranged on the outer peripheral surface of the input shaft, the driving blade can move in the blade groove and can prop the two wedging pieces open towards two ends, the wedging pair can be switched between a jointing state and a transmission state, the wedging pair is arranged in the wedging groove to enable the input shaft to be arranged in the cavity of the output shaft, the width of the wedging groove is larger than the thickness of the wedging pair in a fit state, and when the wedging pair is in a transmission state, the top surface and the bottom surface of the wedging pair respectively extrude the top surface and the bottom surface of the wedging groove.
2. A bi-directional overrunning clutch according to claim 1 wherein: the output shaft comprises an upper cover and an output end, the upper cover is arranged above the output end, an annular bulge is formed by extending towards the inner side in a cavity of the upper cover, a corresponding annular bulge is formed by extending towards the inner side in the cavity of the output end, the upper cover and the output end are connected through a bolt, and the two annular bulges are arranged in parallel at intervals to form a wedging groove.
3. A bi-directional overrunning clutch according to claim 2 wherein: the bottom of the upper cover is provided with a positioning groove in a stepped arrangement mode, the inner diameter of the positioning groove is the same as the outer diameter of the top of the output end, and the top of the output end can be inserted into the positioning groove and then connected with the upper cover through a bolt.
4. A bi-directional overrunning clutch according to claim 2 wherein: the wedge-caulking groove is characterized by further comprising a first bearing and a second bearing, wherein the first bearing is arranged between the upper cover and the input shaft, the second bearing is arranged between the output end and the input shaft, a gap is formed between the top surface of the wedge-caulking pair in the attached state and the top surface of the wedge-caulking groove, and a gap is formed between the bottom surface of the wedge-caulking pair and the bottom surface of the wedge-caulking groove.
5. The bi-directional overrunning clutch according to claim 4, wherein: the bearing comprises an upper cover and is characterized in that a first check ring is arranged on an annular bulge of the upper cover, the first check ring and the annular bulge of the upper cover enclose a first bearing groove, a second check ring is arranged below the annular bulge of the output end, the second check ring and the annular bulge of the output end enclose a second bearing groove, the first bearing is arranged in the first bearing groove, and the second bearing is arranged in the second bearing groove.
6. A bi-directional overrunning clutch according to claim 2 wherein: and a plurality of driving teeth are uniformly arranged on the peripheral surface of the output end along the circumferential direction.
7. A bi-directional overrunning clutch according to claim 1 wherein: four grooves with inclined surfaces are formed in each wedging sheet, four grooves of the two wedging sheets are enclosed to form four blade grooves, the input shaft is correspondingly provided with four driving blades with two narrow ends and a wide middle, and the driving blades correspond to the blade grooves one by one.
8. A bi-directional overrunning clutch according to claim 1 wherein: spring grooves are formed in the top and the bottom of the wedging pair, spring cross rods are arranged in the spring grooves, one end of each tension spring is hung on the spring cross rod at the top of the wedging pair, and the other end of each tension spring is hung on the spring cross rod at the bottom of the wedging pair.
9. A transmission mode of a clutch is characterized in that: when the input shaft is kept still, the wedging pair is kept in a joint state, the groove width of the wedging groove is larger than the thickness of the wedging pair in the joint state, and a transmission chain between the output shaft and the input shaft is disconnected, so that the output shaft can rotate independently; when the input shaft starts to rotate, the driving blade moves and props the wedging pair open towards two ends, the wedging pair is converted into a transmission state from a joint state, the top surface and the bottom surface of the wedging pair extrude the top surface and the bottom surface of the wedging groove, and the transmission chain between the output shaft and the input shaft is connected, so that the input shaft can drive the output shaft to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292166.1A CN114017449B (en) | 2021-11-03 | 2021-11-03 | Bidirectional overrunning clutch and transmission mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292166.1A CN114017449B (en) | 2021-11-03 | 2021-11-03 | Bidirectional overrunning clutch and transmission mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017449A true CN114017449A (en) | 2022-02-08 |
| CN114017449B CN114017449B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111292166.1A Active CN114017449B (en) | 2021-11-03 | 2021-11-03 | Bidirectional overrunning clutch and transmission mode |
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| CN (1) | CN114017449B (en) |
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| CN114017449B (en) | 2024-05-17 |
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